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  Euclid: Reconstruction of weak-lensing mass mapsfor non-Gaussianity studies

Pires, S., Vandenbussche, V., Kansal, V., Bender, R., Blot, L., Bonino, D., et al. (2020). Euclid: Reconstruction of weak-lensing mass mapsfor non-Gaussianity studies. Astronomy and Astrophysics, 638: A141. doi:10.1051/0004-6361/201936865.

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Pires, S., Author
Vandenbussche, V., Author
Kansal, V., Author
Bender, R.1, Author           
Blot, L., Author
Bonino, D., Author
Boucaud, A., Author
Brinchmann, J., Author
Capobianco, V., Author
Carretero, J., Author
Castellano, M., Author
Cavuoti, S., Author
Clédassou, R., Author
Congedo, G., Author
Conversi, L., Author
Corcione, L., Author
Dubath, F., Author
Fosalba, P., Author
Frailis, M., Author
Franceschi, E., Author
Fumana, M., AuthorGrupp, F., AuthorHormuth, F., AuthorKermiche, S., AuthorKnabenhans, M., AuthorKohley, R., AuthorKubik, B., AuthorKunz, M., AuthorLigori, S., AuthorLilje, P. B., AuthorLloro, I., AuthorMaiorano, E., AuthorMarggraf, O., AuthorMassey, R., AuthorMeylan, G., AuthorPadilla, C., AuthorPaltani, S., AuthorPasian, F., AuthorPoncet, M., AuthorPotter, D., AuthorRaison, F., AuthorRhodes, J., AuthorRoncarelli, M., AuthorSaglia, R., AuthorSchneider, P., AuthorSecroun, A., AuthorSerrano, S., AuthorStadel, J., AuthorCrespí, P. Tallada, AuthorTereno, I., AuthorToledo-Moreo, R., AuthorWang, Y., Author more..
Affiliations:
1Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159895              

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 Abstract: Weak lensing, which is the deflection of light by matter along the line of sight, has proven to be an efficient method for constraining models of structure formation and reveal the nature of dark energy. So far, most weak-lensing studies have focused on the shear field that can be measured directly from the ellipticity of background galaxies. However, within the context of forthcoming full-sky weak-lensing surveys such as Euclid, convergence maps (mass maps) offer an important advantage over shear fields in terms of cosmological exploitation. While it carry the same information, the lensing signal is more compressed in the convergence maps than in the shear field. This simplifies otherwise computationally expensive analyses, for instance, non-Gaussianity studies. However, the inversion of the non-local shear field requires accurate control of systematic effects caused by holes in the data field, field borders, shape noise, and the fact that the shear is not a direct observable (reduced shear). We present the two mass-inversion methods that are included in the official Euclid data-processing pipeline: the standard Kaiser & Squires method (KS), and a new mass-inversion method (KS+) that aims to reduce the information loss during the mass inversion. This new method is based on the KS method and includes corrections for mass-mapping systematic effects. The results of the KS+ method are compared to the original implementation of the KS method in its simplest form, using the Euclid Flagship mock galaxy catalogue. In particular, we estimate the quality of the reconstruction by comparing the two-point correlation functions and third- and fourth-order moments obtained from shear and convergence maps, and we analyse each systematic effect independently and simultaneously. We show that the KS+ method substantially reduces the errors on the two-point correlation function and moments compared to the KS method. In particular, we show that the errors introduced by the mass inversion on the two-point correlation of the convergence maps are reduced by a factor of about 5, while the errors on the third- and fourth-order moments are reduced by factors of about 2 and 10, respectively.

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Language(s): eng - English
 Dates: 2020-06-26
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1051/0004-6361/201936865
Other: LOCALID: 3251822
 Degree: -

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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: France : EDP Sciences S A
Pages: - Volume / Issue: 638 Sequence Number: A141 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1